New to me Barracuda with Mopar Crate 390hp low oil pressure

The largest MOPAR Magnum heads and prior owner said they were machined for 2.20 or 2.02 exhaust valves. Idk if that’s even possible. I can verify it has 1.7 ratio roller rockers and she sounds like a big cam. Exhaust is full length TTI headers.
Most likely 2.02 intake valves